An additional calculation is made of diffraction of Rayleigh waves on homogeneous, isotropic elastic wedges following a formulation by Kane and Spence [Geophys. 28, 715–723 (Oct. 1963)]. For the wedges of which interior angles are close to 180°, power transmission, reflection and radiation coefficients can be derived in simple quadratic forms. Numerical data for rapid estimation of these coefficients are presented as functions of Poisson ratio.Subject Classification: [43]20.30; [43]35.54.