We analyze the scattering of the surface plasmon incident at a planar interface between two dielectrics. By
using the scattering matrix technique, developed by Oulton et al. [Phys. Rev. B 76, 035408 (2007)], we
calculate the transmission, reflection coefficients and radiative losses for oblique incident angles. We found that
the transmission of a surface wave through a single interface between two dielectrics may be accompanied with
radiation losses of 10-40 per cent of the plasmon energy.