  Measurements of the ${^2}H(\vec{e},e^{\prime}p)n$ reaction were performed
using an 800-MeV polarized electron beam at the MIT-Bates Linear Accelerator
and with the out-of-plane magnetic spectrometers (OOPS). The
longitudinal-transverse, $f_{LT}$ and $f_{LT}^{\prime}$, and the
transverse-transverse, $f_{TT}$, interference responses at a missing momentum
of 210 MeV/c were simultaneously extracted in the dip region at Q$^2$=0.15
(GeV/c)$^2$. On comparison to models of deuteron electrodisintegration, the
data clearly reveal strong effects of relativity and final-state interactions,
and the importance of the two-body meson-exchange currents and isobar
configurations. We demonstrate that these effects can be disentangled and
studied by extracting the interference response functions using the novel
out-of-plane technique.
