Reflected light phase curves of atmospheres with Rayleigh or Mie scattering particles for various optical depths, surface albedos, and single scattering albedos. The panels show the normalized Stokes I (top), normalized Stokes Q (center), and degree of polarization (bottom). The phase curves computed with ARTES (red solid lines) are benchmarked with results from Buenzli & Schmid (2009), Stam et al. (2004), Kattawar & Adams (1971), and the Lambertian surface reflection (symbols). The Monte Carlo errors are smaller than the line widths.