The ornamental design for a surface configuration of a rear bumper for a vehicle, as shown and described.
This application is related to co-pending application Ser. No. 29/129,138, of the inventor, filed on even date herewith and entitled "Surface Configuration of a Vehicle and Toy."
FIG. 1 is a front view of a surface configuration of a rear bumper for a vehicle according to my novel design;
FIG. 2 is a left side view of the surface configuration of a rear bumper for a vehicle according to my novel design, the right side view being mirror symmetrical; and,
FIG. 3 is a perspective view from the left of the surface configuration of a rear bumper for a vehicle according to my novel design, the perspective view from the right being mirror symmetrical.