Averaged polarization degree at 3.5–6 keV versus the observer’s inclination, i, and reflector’s half-opening angle, Θ, for ρ/ρ_in = 1.2 (top) and ρ/ρ_in = 1.9 (bottom). For the cone geometry (left), we show the reflected-only polarization degree, p in %. For the torus (center) and bowl (right) geometries, we show the polarization degree difference Δp in %, which is the polarization degree p of the reflecting cone subtracted from the polarization degree p of the reflecting torus or bowl, respectively, in identical configurations. The results are plotted for B = 1, ξ₀ = 500 erg ⋅ cm ⋅ s⁻¹, β = 2, and isotropic unpolarized source. The dashed diagonal line corresponds to the grazing-angle inclination. The pink-shaded areas in the central panels for high i and low Θ of the torus correspond to the configurations where the entire illuminated part of the torus is obscured.