Stacked metallized film caps -- what's the "outside" foil?
I would think so, particularly if there are traces passing under an SMT capacitor. 

The fly in the ointment is that few manufacturers specify which end is which on the datasheet so you may have trouble getting the assembly right. Panasonic 'sort-of' indicates a direction on their datasheet (unless it loses something in the translation), but it's not really unambiguously tied to orientation of the markings or orientation in the tape (via the packaging specifications), that I can see anyway.