The ornamental design for a surface ornamentation for a door window, as shown and described.
FIG. 1 is an elevational view of a surface ornamentation for a door window showing my new design;
FIG. 2 is a elevational view of a second embodiment of a surface ornamentation for a door window showing my new design; and,
FIG. 3 is an elevational view of a third embodiment of a surface ornamentation for a door window showing my new design.
The broken line showing of the remainder of the door is for illustrative purposes only and forms no part of the claimed design. The depicted contrast in shading represents a contrast in appearance via color, texture, and/or luminance.