  The polarization and the susceptibility of a ferroelectric multilayer with a
non-ferroelectric slab are investigated within the framework of transverse
Ising model with a four-spin interaction term. The effect of the thickness and
the position of the non-ferroelectric slab are investigated in this paper. We
find that the increase of the thickness of the non-ferroelectric will decrease
the polarization and the susceptibility of the film. If the position of the
non-ferroelcetric slab shifts from the center of the film to the surface, the
number of the peaks of the susceptibility will change. And a step-like
polarization curve is found.
