The ornamental design for an exteriorsurfaceconfiguration of a rear light, as shown and described.
FIG. 1 is a front view of an exterior surface configuration of a rear light
according to our novel design with the broken line showing for
illustrative purposes only and forming no part of the claimed design;
FIG. 2 is a right side view of an exterior surface configuration of a rear
light according to our novel design; and,
FIG. 3 is a perspective view from the front right of an exterior surface
configuration of a rear light according to our novel design.
This design represents one embodiment of an exterior surface configuration
of a rear light. The depicted embodiment is the left side rear light. The
design also contemplates a right side rear light embodiment that is mirror
symmetrical to the design illustrated and is therefore not separately
illustrated. The dash line included denotes environment and is not part of
the claimed design.