Schematic representation of our calculations. The radiation is generated by the interaction between the SN ejecta the disk-like CSM, with a luminosity of L_sh. A portion of this radiation escapes from the surface of the CSM disk before reaching the photosphere (indicated by the dotted lines in the CSM), with a luminosity of L_surface, while the remaining radiation escapes from the photosphere, with a luminosity of L_ph. The radiation emitted from the photosphere can be polarized due to the last scattering above the photosphere.