  We report anomalous behavior in a double-layer two dimensional hole gas
(2DHG) at even integer filling factors which includes hysteresis in the
longitudinal and Hall resistances and a very weak temperature dependence of the
resistance minima. All anomalies disappear and the conventional quantum Hall
effect behavior recovers when a thin metal film is placed on top of the 2DHG.
The behavior is attributed to presence of the theoretically predicted magnetic
ordering at even integer filling factors which causes the formation of
macroscopic spin-charge domains.
