Interpretation of coincidence form factors in electron-nucleon knockout reactions

We point out that for two extreme reaction mechanisms describing nucleon ejection in the coincidence reaction $A(\mathrm{e},{\mathrm{e}}^{\prime }\mathrm{N})B$ (resonance or quasifree knockout) the interference form factors can be used to make a longitudinal-transverse separation of the inclusive cross section without change in electron scattering angle (resonance case), or a separation of the convection and spin currents in the transverse form factor (quasifree case).