Reflected light signals of planets with horizontally homogeneous clouds composed of Earth-like cloud particles (top row) or Venus-like cloud particles (bottom row), at a phase angle α of 60°. For each model planet, the cloud optical thickness b_c is 2.0, the cloud bottom is at 2.0 km, its top at 4.0 km (see Fig. 1), and the surface is black. Left column: total flux F (normalized to the maximum on the disk); middle column: degree of linear polarization P_l; right column: degree of circular polarization P_c. Integrated across the planetary disk, P_l = 25.5% for the Earth-like clouds and 23.8 % for the Venus-like clouds, in both cases with the polarization direction perpendicular to the planetary scattering plane.