Delocalization transition of a rough adsorption-reaction interface

We introduce a kinetic interface model suitable for simulating adsorption-r eaction processes which take place preferentially at surface defects such a s steps and vacancies. As the average interface Velocity is taken to zero, the self-affine interface with Kardar-Parisi-Zhang-like scaling behavior un dergoes a delocalization transition with critical exponents that fall into a different universality class. As the critical point is approached, the in terface becomes a multivalued, multiply connected self-similar fractal set. The scaling behavior and critical exponents of the relevant correlation fu nctions are determined from Monte Carlo simulations and scaling arguments.