  Radiation reaction has been investigated traditionally in classical dynamics
and recently in non-linear QED for high-intensity field physics by
high-intensity lasers. The non-linearity of QED is predicted as the coupling
between a highly energetic electron and its radiation. However, the applicable
range of external fields in the previous method of the Furry picture is just
the case of a plane wave. In this Volume II, we aim the generalization of this
applicable range by using the stochastic scalar electron model introduced in
Volume I. We discuss the formulation of radiation reaction acting on a
stochastic scalar electron and show the origin of this non-linearity correction
in general conditions.
