"We use the time-dependent Ginzburg{Landau Lawrence{Doniach
model with thermal noise to study angle dependence of electrical conductivity
in high Tc superconductor. The electrical conductivity is calculated as temper-
ature and magnetic eld in the homogeneous phase. When the magnetic eld
is rotated in the plane indicated by the c axis and the direction of the electric
current, the theoretical caculation based on the self-consistent Gaussian ap-
proximation is used to compare with the experimental data of HgBa2CaCu2O6.
Our caculations are in good agreement with the experimental data for temper-
atures below Tc and above Tc. In terms of quality, the increase in resistivity
brought on by a developing magnetic eld at constant strength is comparable
to that brought on by a growing magnetic eld applied orthogonally to the
layers. However, as the magnetic eld approaches an orientation parallel to the layers, the e ects of a perpendicular eld obviously di er from those of a
tilted eld with the same normal component."