Hi all, I'm looking for some suggestions in order to passivate the (110) surface of cleaved GaAs: as soon as I cleave it, the surface is very reactive but it quickly changes its structure in such a way that, after only few minutes I can't etch the sample. I appreciate if someone could provide me with a (simple) recipe for surface passivation that will only passivate a couple of monolayer and that, hopefully, is relatively easy to remove (in order to proceed with wet etching). I appreciate if you could also provide some reference to some work in literature. Thank you for all the help and suggestion you can provide Fabio Altomare