for the Filmetrics F20 - Oregon State University
https://sites.science.oregonstate.edu/~tatej/TateLabWiki/lib/exe/fetch.php?media=manuals:filmetrics_f20_manual.pdf
WEBWhat is the F20 used for? The Filmetrics F20 is used to measure the thickness and optical constants (n and k) of transparent and semi-transparent thin films. Measured films must be optically smooth and between 100Å and 50 microns thick. Commonly measured films include semiconductor process films such as oxides,
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