Dear All, I have found a lot of studies about several properties of MgO surfaces. Similar work on CaO surfaces seems to me to be scarce. Is there any special reason why MgO surface physics should be much more interesting than CaO (or other similar oxides) surfaces? Put it in another way, does anyone of you know if there are important differences between the surface properties of the alkaline earth oxides? Thanks a lot in advance, and best regards from Spain! Andres Aguado.