I'm sorry, I'm only aware of UI design that Apple paid Xerox for with Apple stock. Which are you referring to?
Apple did not steal Xerox's GUI interface. They licensed it for $1 million.
Apple neither paid anything directly to Xerox, nor has Xerox ever agreed that they licensed their GUI to Apple. (The idea that they did, along with the story that Apple solely invented the personal computer, are two of the biggest and most oft repeated myths on the internet.)
Apple offered Xerox the right to
buy 100,000 shares of pre-IPO Apple stock in return for a
visit.
A year or two later Xerox licensed Apple to create a Smalltalk computer as a joint exercise.
When Apple later sued other companies for royalties on GUIs, Xerox sued Apple for trying to make money off the ideas they'd shared. As the
NY Times reported it:
"
Xerox contends that the Lisa and Macintosh software stems from work originally done by Xerox scientists and that it was used by Apple without permission."
"Xerox contends that Apple ''intentionally and purposefully concealed'' the derivation of the Lisa and Macintosh software from Xerox software. It said that Apple's copyrights on Lisa and Macintosh software were invalid and that the company had unjustly received benefits that rightfully belong to Xerox."
--
As for the clock thing, I suspect that's an innocent copy by some developer, and Apple will either change their clock or license the design.
It is interesting that Apple is very strict about rejecting third party app submissions using copyrighted material, but failed to vet their own app in this case.