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Polarization degrees-of-freedom in electronuclear hadron production from finite nuclei

The polarization degrees-of-freedom in electronuclear two-nucleon knockout reactions are discussed. Model calculations for the unpolarized $^{16}$O(e,e$'$pp) cross sections at ($\mid \vec{q} \mid$,$ω$)=(210 MeV,300 MeV/c) are compared to recently obtained data. Predictions for the polarization observables in electronuclear two-nucleon knockout are presented. It is stressed that detailed studies of two-nucleon emission processes permit to constrain the contribution from two-nucleon mechanisms (like meson-exchange and isobar effects) to the single-nucleon knockout channel (e,e$'$p).