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Rutherford Backscattering, Low-energy ion scattering spectroscopy (LEIS), Mid-energy ion scattering spectroscopy (MEIS) might work to detect H. What is your coating thickness?
Is there a reason you cannot use ion beam techniques? One good alternative is to detect recoiling protons from a heavier projectile.
GD-OES might also be a possibility.
Depending on your sample quality you could use Neutron Reflectometry.
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