  We study the behavior of a semi-infinite monolayer, which is placed initially
on a half of an infinite in both directions, ideal crystalline surface, and
then evolves in time due to random motion of the monolayer particles. Particles
dynamics is modeled as the Kawasaki particle-vacancy exchange process in the
presence of long-range attractive particle-particle interactions. In terms of
an analytically solvable mean-field-type approximation we calculate the mean
displacement X(t) of the monolayer edge and discuss the conditions under which
such a monolayer spreads (X(t) > 0), partially wets (X(t) = 0) or dewets from
the solid surface (X(t) < 0).
