Where to apply Unsharp Mask?

I have multiple image layers and adjustment layers, and after doing all of my editing I would like to sharpen the image. Do I just apply the Unsharp Mask to the top most layer to achieve this OR is there some other way? Will it sharpen the details of all the layers if applied to the highest layer?
Thanks.

Guidelines?
Sharpening is almost the very definition of "season to taste".
I've seen a lot of publications that I feel tremendously oversharpen photos, making them look like some artificial construct (but like a lot of other similar publications).  A photographer friend and I were once trying to make prints that looked like those in a coffee table picture book, and we were failing for a while until we tried dialing up the Unsharp Mask to ludicrous levels.
What I suggest you do is to try to get a feel for how what you've done on the screen is going to look as published (e.g., if you make a print, assuming that's what you do).  Then decide on a "look and feel" that you want to express, and try to consistently achieve it with your photos.
One trick I use is to view an image at exactly 50% to try to get a feel for how sharp it will look in print.
By the way, depending on what you're after, there are better sharpening tools than Unsharp Mask available.
-Noel

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