Surface diffusion was studied in a system with 2 different activation energies. The dynamic and thermodynamic properties of the system of interacting ad-atoms on an face-centered cubic (111) surface were studied using Monte Carlo simulations, the Bortz–Kalos–Lebowitz algorithm and the Metropolis algorithm.

Monte Carlo Simulation of Diffusion in a Two-Barrier System. M.Mašín, Z.Chvoj, P.Jelínek, J.Heinonen: Surface Science, 2002, 516[1-2], 169-78