  We consider nonlinear interaction of superpower laser pulses of relativistic
intensities with nanolayers and solid-plasma-targets towards the production of
high energy-density electron bunches along with nuclear radiation (hard $%
\gamma $-quanta and positron fluxes). It is shown that petawatt lasers are
capable of producing via two-target scheme high density field free
electron/positron bunches and substantial amounts of $\gamma $-quanta with
energies up to $200$ MeV. For actual supershort and tightly focused--strongly
nonplane ultrarelativistic laser pulses of linear and circular polarizations
3D3V problem is solved via numerical simulations.
