Correction to "Surface Electromagnetic Modes of a Ferrite Slab" (Letters)

In the above paper, (23) is incorrectly referenced. The correct reference should be [4]. A second error appears on page 760 in the second sentence of the paragraph beginning immediately above Fig. 2. In this sentence the words "dynamic" and "magnetostatic" should be interchanged. The authors wish to thank J. Sethares of the Air Force Cambridge Research Laboratories for bringing the latter error to their attention.