I use THZ-TDs to obtain the complex conductivity of a thin film. As a formula for processing the spectra, I use the Tinkham formula given in all works of this kind. However, I could not find its conclusion or detailed description anywhere, including in the book [Michael_Tinkham]_Introduction_to_superconductivity. Tell me, please, where is the source of this formula.

I will be grateful for any help you can provide.

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