  We provide an inhomogeneous solution concerning the dynamics of a real self
interacting scalar field minimally coupled to gravity in a region of the
configuration space where it performs a slow rolling on a plateau of its
potential. During the inhomogeneous de Sitter phase the scalar field dominant
term is a function of the spatial coordinates only. This solution specialized
nearby the FLRW model allows a classical origin for the inhomogeneous
perturbations spectrum.
