The film was modeled using initial optical constants from
Woollam. A thin EMA surface roughness layer, consisting of 50/50
mix of organic film and void (n¼1) was used. In the initial stage, a
Cauchy dispersion model was used to fit the transparent region of
500–1550 nm. Then, the complete model was minimized by fitting
the optical constants on a point-by-point basis over the full spectral
range in which the data in each single wavelength is fit separately