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There's no real advantage, and plenty of potential disadvantages, to putting a UV filter in front of a polarizing filter. The polarizing filter itself probably cuts UV very well because of the properties of the polarizing foil.
The addition of an extra filter increases the risk of flare - you are adding two extra parallel refelecting surfaces. You are also adding to the 'tube' effect of the filters - with a wide angle lens you could get cut-off in the corners, also called vignetting.