  We present a systematic study of the corrections to both the longitudinal
conductivity and Hall resistivity due to electron-electron interactions in high
quality GaAs systems using the recent theory of Zala et al. [Phys. Rev. B 64,
214204 (2001)]. We demonstrate that the interaction corrections to the
longitudinal conductivity and Hall resistivity predicted by the theory are
consistent with each other. This suggests that the anomalous metallic drop in
resistivity at B=0 is due to interaction effects and supports the theory of
Zala et al.
