  We propose using a Stark interference technique to directly measure the
odd-parity c_{0j} components of the electron sector c_{\mu\nu} tensor of the
Standard-Model Extension. This technique has been shown to be a sensitive probe
of parity violation in atomic dysprosium in a low-energy, tabletop experiment,
and may also be straightforwardly applied to test Lorentz invariance. We
estimate that such an experiment may be sensitive to c_{0j} coefficients as
small as 10^{-18}.
