Hello, You do not need DL model to describe organic materials, they are described using regular dielectric permittivity (complex if you want to account for dielectric losses). You can determine them from the known refractive indices. For ITO it might be different, because it is conductive and in some spectral bands should be considered as metal. However, for your application, depending on the spectral properties of ITO in required spectral band, you might be able to describe it as a dielectric media as well. I think that in visible range it should be possible.
With best regards, Shavkat
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