  The influence of random interlayer exchange on the phase states of the
simplest magnetic heterostructure consisting of two ferromagnetic Ising layers
with large interaction radius is studied. It is shown that such system can
exist in three magnetic phases: ferromagnetic, antiferromagnetic and
ferrimagnetic. The possible phase diagrams and temperature dependencies of
thermodynamic parameters are described. The regions of existence of the
magnetic phases in external magnetic field are determined at zero temperature.
