Left: maximum degree of polarization p (cf. Eq. (3)) for silicate grains with sizes between 10 nm and 1 mm and a size distribution of n(s) ∝ s^−2.5ds as a function of scattering angle θ at a wavelength of λ = 1.6 mm. Right: corresponding intensity map of a face-on disk with superimposed polarization vectors. The length of the polarization vectors are scaled to the maximum polarization degree present in the figure.