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

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Jürgen Weippert

You're looking for something like this?

https://www.shimadzu.com/an/service-support/technical-support/technical-information/uv-vis/uv-ap/film/index.html

Alan F Rawle

I measured the thickness of liquid crystal cells using this method (the cell spacing is the liquid crystal layer sandwiched between 2 pieces of glass). These cell spacings were typically in the 2 - 20 micron region and the RI of the liquid crystal was well known or easily measured (e.g. with an Abbe refractometer) even though birefringent.

Some nice software at:

https://thinfilmview.com/en/