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We have used n→ 111 In→ 111 Cd perturbed-angular-correlation (PAC) spectroscopy to measure hyperfine interactions at surface sites on GaAs(111)B (As-terminated) surfaces. The (111)B surfaces form two reconstructions, 2 2, which is formed under As-rich conditions and is stable below ∼700 K, and √19 √19R23.4°, which is formed under Ga-rich conditions above this...