The spectral distribution of the scattered irradiance at 40° in the forward direction and at 140° in the backward direction have been measured for a series of five silver films and five gold films, in the visible and near infrared. The films were produced by evaporation to form a highly aggregated structure, with particles that had a somewhat-limited size variation for each film; the modal sizes ranged from 275 to 4000 Å for the silver films, and from 160 to 740 Å for the gold films. The experimental curves showed maxima in the spectral region studied, except for silver backscattering.
E. A. Allen, G. D. Scott, K. T. Thompson, and F. Veas, "Light scattering from aggregated silver and gold films," J. Opt. Soc. Am. 64, 1190-1193 (1974)