Two-dimensional metal-insulator transition in smooth random magnetic fields

We re-examine the delocalization problem of two-dimensional electrons in th e presence of random magnetic fields. By introducing short-range spatial co rrelations among random fluxes, a well-defined metal-insulator transition c haracterized by a two-brunch scaling of conductance has been demonstrated n umerically. Critical conductance is found non-universal with a value around e(2)/h. interesting connections of this system with the recently observed B = 0 two-dimensional metallic phase (Kravchenko et al. Phys. nev. B, 50 (1 994) 8039) are also discussed.