I am curious as to the specific technique, as far as cutting the bark and cambium.... I've read and seen videos of people doing it different ways, for example.... Stripping off all the bark and cambium all the way around the trunk, similar to an air layer. Cutting small strips of bark and cambium out. Only small incisions all the way around. No cutting, just burying.....? What is the technical difference between a ground layer and an air layer?....just the fact that it is in contact with the soil surface??....or is there more? I think I will have some layering candidates this year...or next. Thanks!