Comments on "Comparison of three high-frequency diffraction techniques"

It is shown that the method of edge waves (MEW) [1] (or "physical theory of diffraction") describes the secondary edge waves correctly. Opposing statement found in [2]-[4] results from some misunderstanding. It is noted that both MEW and the geometrical theory of diffraction may predict, at best, only the first two terms in an asymptotic expansion (with k → ∞) of the sum of the edge waves for real three-dimensional bodies. Some formulas dealing with MEW in [1] are defined more precisely.