a1 Department of Plasma Physics, Umeå University, S-901 87 Umeå, Sweden
a2 N. S. Kurnakov Institute, Academy of Sciences of the U.S.S.R., Moscow,U.S.S.R.
A plasma with a boundary transition layer of variable depth in the presence of a powerful electromagnetic field is considered. It is shown that a displacement of the boundary will grow, and will propagate as a nonlinear surface wave in the direction in which the depth of the transition layer decreases.
(Received May 28 1991)
(Revised August 05 1991)