(Received 19 May 1998)
Using a mapping of a layered three-dimensional system with significant interlayer tunneling onto a spin Hamiltonian, the phase diagram in the strong magnetic-field limit is obtained in the semiclassical approximation. This phase diagram, which exhibits a metallic phase for a finite range of energies and magnetic fields, and the calculated associated critical exponent nu = 4/3 agree excellently with existing numerical calculations. The implication of this work for the quantum Hall effect in three dimensions is discussed.
PACS: 73.40.Hm, 64.60.Fr, 73.20.Dx
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