  We construct double layered solutions to the extended Fisher-Kolmogorov
P.D.E., under the assumption that the set of minimal heteroclinics of the
corresponding O.D.E. satisfies a separation condition. The aim of our work is
to provide for the extended Fisher-Kolmogorov equation, the first examples of
two-dimensional minimal solutions, since these solutions play a crucial role in
phase transition models, and are closely related to the De Giorgi conjecture.
