  An uncommon double-ray scenario of light resonant scattering by a periodic
metasurface is proposed to provide strong non-specular reflection. The
metasurface is constracted as an array of silicon nanodisks placed on thin
silica-on-metal substrate. A low-lossy non-specular resonant reflection for any
direction and any polarization of incident wave is revealed by a numerical
simulation of light scattering. The conditions for the implementation of an
autocollimation scheme of scattering and the observation of non-specular
reflected ray that does not lie in the incidence plane are worked out. It is
shown that the change of dielectric substrate thickness may be applied to set
the width of frequency band of non-specular reflection. The light intensity
related to the specular and non-specular reflected ray can be controlled by
changing the angle of incidence or by the polarization of incident wave.
