Hello, I have a question concerning a PDE with specific IC/BC, that describes diffusion of a species in a moderately solid thin film with a finite thickness on a solid substrate that is considered semi-infinite. The thin film has an impermeable boundary at x = -h, and the interface between the thin film and the substrate occurs at x=0.  It is possible that the species of interest may be substantially depleted from the substrate, depending on how long the experiment runs.  I am not sure that I have set up the code correctly, and am using Maple 11.