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An outstanding question concerning the underdoped cuprate concerns the truenature of their Fermi surface which appears as a set of disconnected arcs.Theoretical models have proposed two distinct possibilities: (1) each arc isthe observable part of a partially-hidden closed pocket, and (2) each arc isopen, truncated at its apparent ends. We show that measurements of thevariation of the interlayer resistance with the direction of a magnetic fieldparallel to the layers can qualitatively distinguish closed pockets from openarcs. This is possible because the field can be oriented such that allelectrons on arcs encounter a large Lorentz force and resultingmagnetoresistance whereas some electrons on pockets escape the effect by movingparallel to the field.

Proposed measurements of the interlayer magnetoresistance of underdoped  cuprate superconductors can distinguish closed pockets from open arcs in the  Fermi surface