The ornamental design for a surface for an article of manufacture, as shown and described.
FIG. 1 is a front elevational view of a surface for an article of manufacture wherein, for purposes of illustration, the article of manufacture is a headboard;
FIG. 2 is a right side profile of a surface for an article of manufacture wherein, for purposes of illustration, the article of manufacture is a headboard, the left side profile being a mirror image thereof; and,
FIG. 3 is a top view of a surface for an article of manufacture wherein, for purposes of illustration, the article of manufacture is a headboard.
The broken lines are for environmental purposes only and form no part of the claimed design.