Copyright © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Newly obtained experimental data for the reflectivity of Xenon plasmas at pressures of 10-12 GPa at large incident angles are analyzed. Using a Fermi-like density profile along the shock wave front, the reflectivity coefficients for the s and p - polarized waves were calculated. The influence of atoms which were taken into account at the level of collision frequency unique density prove to be crucial for the understanding of the reflection process. Subsequently, as physically expected, a profile is sufficient to obtain good agreement with the experimental data at all investigated optical laser frequencies. (© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim).