I appreciate your reply--however, my question is about Photoshop CC icon
resizing, not Windows icon resizing.
Edit > Preferences > Experimental Features > Scale UI 200% (note this is in Windows; not sure if Mac version has it)
Hey, Warunicorn--You da man!!!! Thanks for the solution. I teach PS at a local college and I never new about the "Experimental" Preferences menu. I will share this critical (for ultra-high def monitors) setting with my students.
Smiles across the miles . . .