The relationship between Mitzner´s ILDC and Michaeli´s equivalent currents

Michaeli recently derived a set of equivalent edge currents for scattering directions not on the Keller cone. Some years ago, Mitzner developed his incremental length diffraction coefficient (ILDC) for the same purpose. It is shown that Michaeli´s results relate to Mitzner´s for arbitrary directions in identically the way Keller´s relate to Ufimtsev´s for directions on the Keller cone.