Supplement Number 1

Graphs (a), (c), and (e) show the measured ellipsometric angles psi and delta (dotted lines), across the wavelength range of 200 - 1700 nm, along with models for psi (light blue continuous line) and delta (red continuous line). Models were calculated using the Effective Medium Approximation (EMA) model. Graphs (b), (d), and (f) show the refractive indices n (black line), and k (red line) for samples A2, B2, and C2.