  We add a random bulk term, modelling the interaction with the impurities of
the medium, to a standard functional in the gradient theory of phase
transitions consisting of a gradient term with a double well potential. We show
that in $d\le2$ there exists, for almost all the realizations of the random
bulk term, a unique random macroscopic minimizer. This result is in sharp
contrast to the case when the random bulk term is absent. In the latter case
there are two minimizers which are (in law) invariant under translations in
space.
