  We present a detailed analysis of electron trajectories within the sheath
regions of capacitively coupled plasmas excited by radio-frequency voltage
waveforms at low pressures. Complex features inside the sheaths are identified
in several physical quantities, which are sculptured by the trajectories of the
bouncing electrons under the influence of the spatio-temporally varying
electric field. A method is developed to explain the generation of the various
features as a function of surface processes and to identify the trajectories of
electrons of different origin.
