2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58543We consider the Dirichlet-to-Neumann map associated to the Schrödinger equation with a potential in a bounded Lipschitz domain in three or more dimensions. We show that the integral of the potential over a two-plane is determined by the Cauchy data of certain exponentially growing solutions on any neighborhood of the intersection of the two-plane with the boundary.Final revision, to appear in the Duke Mathmematical JournalAnalysis of PDEsMathematical Physics35R30; 44A12text