  A recursive Green's function technique is developed to calculate the
spin-dependent conductance in mesoscopic structures. Using this technique, we
study the spin-dependent electronic transport of quantum point contacts in the
presence of the Rashba spin-orbit interaction. We observed that some
oscillations in the `quantized' conductance are induced by the spin-orbit
interaction, and indicated that the oscillations may stem from the spin-orbit
coupling associated multiple reflections. It is also indicated that the 0.7
structure of the conductance observed in mesoscopic experiments would not stem
from the spin-orbit interaction.
