  Ion temperature anisotropy is a common feature for (quasi-)perpendicular
collisionless shocks. By using two-dimensional full particle simulations, it is
shown, that the ion temperature component perpendicular to the shock magnetic
field at the shock foot region is proportional to the square of the Alfven Mach
number divided by the plasma beta. This result is also explained by a simple
analytical argument, in which the reflected ions get energy from upstream
plasma flow. By comparing our analytic and numerical results, it is also
confirmed that the fraction of the reflected ions hardly depends on the plasma
beta and the Alfven Mach number when the square of the Alfven Mach number
divided by the plasma beta is larger than about 20.
