Hi Weizi,
I know this is rather after the event, but should you do the experiment again, it is probably much easier to get surface sensitivity in this sort of system using conversion electron yield e.g. Schroeder et al Surface Science Volume 324,
Issues 2–3, 10 February 1995, Pages L371-L377.
That should suffer no over-absortpion issues and bulk fluorescence on a film of this thickness will have only a small amount of over absorption at 45 degrees
Regards
Fred
J.F.W. Mosselmans
Principal Beamline Scientist I18
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