Partial data for the neumann-dirichlet magnetic Schrödinger inverse problem

We show that an electric potential and magnetic eld can be uniquely determined by partial boundary measurements of the Neumann-to- Dirichlet map of the associated magnetic Schrödinger operator. This improves upon the results in [4] by including the determination of a magnetic eld. The main technical advance is an improvement on the Carleman estimate in [4]. This allows the construction of complex geometrical optics solutions with greater regularity, which are needed to deal with the rst order term in the operator. This improved regularity of CGO solutions may have applications in the study of inverse problems in systems of equations with partial boundary data.