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User experience always comes first for workable interface.
Best example is to design any interface, start with "Sketch/wf. "Sketch/wf" part is experience, in which you decide the flow of work. After that you make it attractive by colors and shape, which is called Interface.
user experience is the outcomes a user generate from using/interacting with a user interface design of a system!
How i sees it, user experience will help you design a better user interface design for your mobile application.