  The inhomogeneous Muskat problem models the dynamics of an interface between
two fluids of differing characteristics inside a non-uniform porous medium. We
consider the case of a porous media with a permeability jump across a
horizontal boundary away from an interface between two fluids of different
viscosities and densities. For initial data of explicit medium size, depending
on the characteristics of the fluids and porous media, we will prove the global
existence and uniqueness of a solution which is instantly analytic and decays
in time to the flat interface.
