Thin-film morphology dependence on adatom-substrate interaction energy

We study, by kinetic Monte Carlo, the influence of adatom-substrate interaction energy on the morphology of heteroepitaxial film growth. We take the case of (1+1)-dimensions for sake of simplicity. We also define $\alpha$ as the quotient between the above interaction and the adatom-adatom interaction. We measure the roughness in time. We show that changing the value of $\alpha$ it is possible to range from a wetting regime to a non-wetting one. We also show that above a critical thickness, film growth becomes independent of adatom-substrate interaction.