We show that type 0B theory has a classical AdS(5) x S-5 solution and argue
that it is stable at the string-theory level for small enough radius. The
dual 4-d conformal field theory is the infrared limit of the theory on N el
ectric D3-branes coincident with N magnetic D3-branes. We explicitly constr
uct this SU(N) x SU(N) gauge theory with global SO(6) symmetry and verify t
hat the one-loop term in the beta function vanishes exactly, while the two-
loop term vanishes in the large N limit. We find that this theory is relate
d by a certain projection to the maximally supersymmetric Yang-Mills theory
suggesting its large N conformal invariance to all orders in perturbation
theory.