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This paper presents the modeling of both coherent and incoherent scattering processes from rough surfaces at THz frequencies with the focus on polarization aspects. In a ray tracing algorithm, coherent scattering is implemented based on the Kirchhoff theory whereas a perturbation approach is used for the incoherent contribution. Geometrical depolarization is accounted for by means of the Jones calculus. Ray tracing is applied in a small indoor scenario to demonstrate the influence of depolarization on THz propagation channels.