WETTING TRANSITIONS OF THIN MULTILAYER FILMS WITH OPPOSITE SURFACE FIELDS

Wetting transitions of very thin three-dimensional ferromagnetic Ising films with opposite surface fields are studied by using a self-consis tent cluster method. The main result is that the wetting transitions o f a thin film depend on the thickness L of the film. When L is small t he quasiwetting is suppressed and only the layering exists; while as L greater than or equal to L(C) (L(C) = 20 in our model), both the quas iwetting and the layering can be observed. The question of critical-po int shift in the thin film is also discussed.