  We calculated the self-energy corrections beyond the mean-field solution of
the rotating antiferromagnetism theory using the functional integral approach.
The frequency dependence of the scattering rate ${1}/{\tau}$ is evaluated for
different temperatures and doping levels, and is compared with other approaches
and with experiment. The general trends we found are fairly consistent with the
extended Drude analysis of the optical conductivity, and with the nearly
antiferromagnetic Fermi liquid as far as the ${\bf k}$-anisotropy is concerned
and some aspects of the Marginal-Fermi liquid behavior. The present approach
provides the justification from the microscopic point of view for the
phenomenology of the marginal Fermi liquid ansatz, which was used in the
calculation of several physical properties of the high-$T_C$ cuprates within
the rotating antiferromagnetism theory. In addition, the expression of
self-energy we calculated takes into account the two hot issues of the
high-$T_C$ cuprate superconductors, namely the Fermi surface reconstruction and
the hidden symmetry, which we believe are related to the pseudogap.
