Is the EUV mirror advantage genuinely tacit institutional know-how (not IP), and is the sub-0.1nm RMS roughness figure accurate?

claim-euv-mirror-advantage-is-tacit-know-how-not-patent carries an [unverified-mechanism] and an [unverified-quant] flag. Both the causal claim (that Nikon and Canon cannot enter EUV because the ASML/Zeiss advantage is embedded institutional/tacit knowledge rather than patent protection) and the figures (mirrors polished below 0.1nm RMS roughness; "15+ years" of failed entry) rest entirely on one Tier-4 industry-explainer, semiconductorx.com — below the sourcing floor for both technical-mechanism and quantitative claims.

Why it matters

This is the modern leg of the capture's four-century trade-secrecy bridge (1608 telescope patent → 1677 Spinoza grinding dish → 2020s EUV mirrors). The bridge is only as strong as this claim, and right now the claim is its weakest link. Until it clears the floor, the note cannot advance past seedling and the bridge cannot be leaned on in any draft.

What would answer it

• A primary ASML or Carl Zeiss SMT technical document, investor material, or engineering writeup stating the EUV collector/projection-optics mirror surface figure and roughness specification (confirm or correct sub-0.1nm RMS).
• Serious industry journalism or analysis (Tier 1-2 — e.g. a named semiconductor analyst, IEEE Spectrum, or a book such as Chris Miller's Chip War) on why Nikon and Canon exited/never entered EUV, and whether the barrier is characterized as tacit manufacturing know-how vs. patents, capital, or the ASML–Zeiss–SRC/imec consortium structure.
• A check on the "15+ years" framing against the EUV development timeline (EUV LLC founding, first ASML EUV shipments, Nikon/Canon public statements).

Candidate next moves

Fetch semiconductorx.com to capture its own cited sources, then chase those to primary. Cross-check against claim-toshiba-machine-sold-ussr-submarine-quieting-tools for the export-control angle on transferable-vs-tacit manufacturing capability.

Progress log

• 2026-08-01 — answered by claim-zeiss-2011-slide-deck-confirms-0-1nm-rms-euv-mirror-surface-figure, claim-burja-and-ip-business-academy-source-asml-zeiss-euv-moat-to-tacit-know-how, and claim-nikon-canon-euv-exclusion-was-consortium-politics-not-failed-imitation. What settled it: a primary 2011 Zeiss SMT slide deck corroborates the sub-0.1nm roughness figure at Tier 1 for that mirror generation, and two named Tier-2 analysts independently confirm the general tacit-knowledge-not-patents thesis — but the specific 'Nikon and Canon spent 15+ years failing to replicate the know-how' story does not hold up: the documented mechanism is EUV-LLC consortium exclusion followed by Nikon's 2008-prototype-then-strategic-exit, not a demonstrated technical imitation failure. Answered as 'partially confirmed, partially corrected,' not a clean yes.