Study concluding that UI is more memorable than UX?

I once came across a study, I even swore the Nielsen Norman group cited it (or perhaps even performed it) but it basically said in a study more people could recall (maybe preferred?) sites that had a pretty UI than a good UX

Does anyone know of this study or has come across it?

Have been racking my brains for ages as its relevant to an article I'm writing!

Thanks in advance