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[paul.boulanger@umontreal.ca]

Hi,

If you want to passivate one of your surfaces, you must add the Hydrogen 
atoms at their respective places by hand. This means modifying the parameters 
ntypat, typat, znucl and xcart. Their positions should be chosen close to the 
correct bond length and bond angle. 

If your slab is thick enough, you shouldn't need to relax these atomic 
positions. For smaller slabs, maybe the relaxation should be done, but I am 
not an expert on slab calculations and this is only my intuition!!

Paul