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Absorbance spectra for a 5 μm thick two‐component layer on CaF2 with ϕ1=0.75 according to Beer's law (eqn. (26), orange curve), the assumption of a zero local field of Lorentz (eqn. (27), turquoise curve), according to Lorentz‐Lorenz (eqn. (28), violet curve) and for micro‐heterogeneous mixing (eqn. (29), green curve).
