How to calculate the thickness of a thin film/substrate from a UV-vis measurement?

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How can I measure the thickness of thin film by Uv-Vis?

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Mikhail Vasiliev

You can fit thickness using software from Article Analysis, Optimization, and Characterization of Magnetic Pho...

if you know the spectra of refractive index and absorption of thin film layer, and the refractive index of substrate

Mohammad Nur-E Alam

Thickness also can be possible to calculate by using the maxima, and minima of the transmission spectrum by using Swanepoel method. See an example in this useful link: https://www.mdpi.com/2079-4991/8/5/355