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We report the temperature($T$) and perpendicular magnetic field($B$)dependence of the Hall resistivity $\rho_{xy}(B)$ of dilute metallictwo-dimensional(2D) holes in GaAs over a broad range oftemperature(0.02-1.25K). The low $B$ Hall coefficient, $R_H$, is found to beenhanced when $T$ decreases. Strong magnetic fields further enhance the slopeof $\rho_{xy}(B)$ at all temperatures studied. Coulomb interaction correctionsof a Fermi liquid(FL) in the ballistic regime can not explain the enhancementof $\rho_{xy}$ which occurs in the same regime as the anomalous metalliclongitudinal conductivity. In particular, although the metallic conductivity in2D systems has been attributed to electron interactions in a FL, these sameinteractions should reduce, {\it not enhance} the slope of $\rho_{xy}(B)$ as$T$ decreases and/or $B$ increases.Comment: Accepted for publication in Physical Review Letter

Temperature and Magnetic-Field-Enhanced Hall Slope of a Dilute 2D Hole System in the Ballistic Regime