Adsorption of self-avoiding walks at an impenetrable plane in the expandedphase: a Monte Carlo study

We consider self-avoiding walks on the simple cubic lattice, confined to th e half-space z greater than or equal to 0. In addition, the walks interact with the plane z = 0 and have a vertex-vertex interaction. The walks can ad sorb at the plane z = 0. The location of the adsorption phase transition de pends, in general, on the contact interaction. We use Monte Carlo methods t o investigate the form of the adsorption phase boundary in the expanded pha se region.