  We consider a finite ferroelectric superlattice in which the elementary unit
cell is made up of l atomic layers of type A and n atomic layers of type B.
Based on the transverse Ising model we examine the phase transition properties
of the ferroelectric superlattice. Using the transfer matrix method we derive
the equation for the Curie temperature of the superlattice. Numerical results
are given for the dependence of the Curie temperature on the thickness and
exchange constants of the superlattice.
