  Classical plasma with any degree degeneration of electronic gas is
considered. In plasma two external electromagnetic field are propagation. It is
required to find the plasma response on these fields. From kinetic Vlasov
equation for collisionless plasmas distribution function in square-law
approximation on sizes of intensivities of two electric fields is received. The
formula for calculation electric current at any temperature (any degree of
degeneration electronic gas) is deduced. This formula contains an
one-dimensional quadrature. It is shown, that the nonlinearity account leads to
occurrence the longitudinal electric current directed along a wave vector. This
longitudinal current is perpendicular to known tranversal classical current,
received at the linear analysis. The case of small values of wave number is
considered. Graphic comparison of dimensionless size of the current depending
on wave number and frequency of oscillation of the electromagnetic fields is
carry out.
