  We consider interactions between surface and interfacial waves in the two
layer system. Our approach is based on the Hamiltonian structure of the
equations of motion, and includes the general procedure for diagonalization of
the quadratic part of the Hamiltonian. Such diagonalization allows us to derive
the interaction crossection between surface and interfacial waves and to derive
the coupled kinetic equations describing spectral energy transfers in this
system. Our kinetic equation allows resonant and near resonant interactions. We
find that the energy transfers are dominated by the class III resonances of
\cite{Alam}. We apply our formalism to calculate the rate of growth for
interfacial waves for different values of the wind velocity. Using our kinetic
equation, we also consider the energy transfer from the wind generated surface
waves to interfacial waves for the case when the spectrum of the surface waves
is given by the JONSWAP spectrum and interfacial waves are initially absent. We
find that such energy transfer can occur along a timescale of hours; there is a
range of wind speeds for the most effective energy transfer at approximately
the wind speed corresponding to white capping of the sea. Furthermore,
interfacial waves oblique to the direction of the wind are also generated.
