The ornamental design for a surfaceconfiguration of a radiator grill for a vehicle, as shown and described.
FIG. 1 is a left perspective view of a surface configuration of a radiator grill for a vehicle according to my novel design, the right perspective view being mirror symmetrical;
FIG. 2 is a front view of the surface configuration of a radiator grill for a vehicle according to my novel design; and,
FIG. 3 is a top view of the surface configuration of a radiator grill for a vehicle according to my novel design.
The broken lines are for illustrative purposes only and form no part of the claimed design.