  We consider the inverse problem of determining an electromagnetic potential
appearing in an infinite cylindrical domain from boundary measurements. More
precisely, we prove the stable recovery of some general class of magnetic field
and electric potential from boundary measurements. Assuming some knowledge of
the unknown coefficients close to the boundary, we obtain also some results of
stable recovery with measurements restricted to some portion of the boundary.
Our approach combines construction of complex geometric optics solutions and
Carleman estimates suitably designed for our stability results stated in an
unbounded domain.
