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Dielectric function of (continuous line) in comparison with the experimental effective dielectric function (open circles). (a) Real part and (b) imaginary part.
(Color online) The effective of samples 1–4 compared with the of the substrate; vertical dashed lines mark the positions of strong -induced features. Inset: second derivative of .
(Color online) Comparison between the dielectric function for a submonolayer of obtained from a model fit and calculated using Eq. (2). The dielectric function for bulk is also plotted. The calculated from Eq. (2) is affected by the experimental noise of two different measurements, namely that of the substrate and of the ultrathin layer .
(Color online) Comparison between the absorption spectra of a thin film on quartz and in solution as reported in Ref. 7. In the upper part, the extinction coefficient of a thick and submonolayer on is plotted .
Thickness of the ultrathin layers on substrates determined from ellipsometry.
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