Plane-wave spectrum representation of a field in a magnetoionic medium due to a plane distribution of source currents

The fields due to a plane distribution of source currents are formulated, in terms of three-dimensional Fourier transforms, to yield equivalent results obtainable from a representation in terms of an angular spectrum of plane waves introduced by Clemmow. Certain difference in the present field expressions and those given by Clemmow in a recent paper are discussed.