  The formal basis for fully relativistic Korringa-Kohn-Rostoker (KKR) or
multiple scattering calculations for the electronic Green function in case of a
general potential is discussed. Simple criteria are given to identify
situations that require to distinguish between right and left hand side
solutions to the Dirac equation when setting up the electronic Green function.
In addition various technical aspects of an implementation of the relativistic
KKR for general local and non-local potentials will be discussed.
