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The zero-field temperature-dependence of the resistivity of two-dimensionalholes are observed to exhibit two qualitatively different characteristics for afixed carrier density for which only the metallic behavior of the so-calledmetal-insulator transition is anticipated. As $T$ is lowered from 150 mK to 0.5mK, the sign of the derivative of the resistivity with respect to $T$ changesfrom being positive to negative when the temperature is lowered below $\sim$30mK and the resistivity continuously rises with cooling down to 0.5 mK,suggesting a crossover from being metal-like to insulator-like.

Disappearance of the metal-like behavior in GaAs two-dimensional holes below 30 mK