  Radiation generated by the passage of a monoenergetic electron bunch above
the surface wave excited in plane interface between homogeneous media with
different dielectric constants is investigated. For the surface wave of general
profile the radiation intensity is expressed via the radiated power from a
single charge and bunch form factor. Various types of transverse and
longitudinal distributions of electrons in the bunch have been considered
including Gaussian, asymmetrical Gaussian, two Gaussian and rectangular
distribution with asymmetrical exponential tails. Conditions are specified
under which the coherent radiation essentially exceeds the incoherent part.
