  The conserved Sine-Gordon Equation with nonconserved shot noise is used to
model homoepitaxial crystal growth. With increasing coverage the renormalized
pinning potential changes from strong to weak. This is interpreted as a
transition from layer-by-layer to rough growth. The associated length and time
scales are identified, and found to agree with recent scaling arguments. A
heuristically postulated nonlinear term $\nabla^2 (\nabla h)^2$ is created
under renormalization.
