Study of a pair of coupled continuum equations modeling surface growth
  In this communication we introduce a pair of coupled continuum equations to model overlayer growth with evaporation-accretion due to thermal or mechanical agitations of the substrate. We gain insight into the dynamics of growth via one-loop perturbative techniques. This allows us to analyze our numerical data. We conclude that there is a crossover behaviour from a roughening regime to a very long-time, large length scale smoothening regime. 
Ain-ul Huda, Omjyoti Dutta and Abhijit Mookerjee