Fit of the ellipsometric data in the UV–Vis range for the reduced haze analog (deposited on a doped Si substrate). The transparent Sellmeier model (blue curve) is only used between 600 and 830 nm as it assumes k = 0. The fitted Sellmeier parameters are: K = 2.569, λ₀ = 138.2 µm and d_f = 1568.6 nm. The Tauc–Lorentz model is shown by the red curve, the fitted parameters are: ε_∞ = 1.98, E_g = 2.01 eV, A = 10.58 eV, Eo = 5.88 eV, C = 2.52 eV and d_f = 1574.6 nm. The absorbent Cauchy model (green curve) fits best with n_∞ = 1.619, D = 9.63E-3, E = −0.314 µm², F = 1.148 µm⁴, B = 1.544 µm², C = 0.21 µm⁴ and d_f = 1558.7 nm. The square residualsχ² are 0.03, 0.15 and 0.25 respectively.