My opinion page addressing inquiries concerning clawhammer technique.
I made a conscious decision to do this as the notation software I use gives me the option to notate it either way. Twenty years ago, the "above the line" method was as popular, or more so, than the "on the line" approach. I found that the "above the line" approach made it easier to read.
When you write tab with the notes superimposed over the line, it becomes difficult to tell the difference between certain fret numbers such as 3, 8, and 5.
It is also hard to write the symbol for slides (glissandos) which is a "dash" instead of an arc; the "dash" blends in with the stave line and so becomes invisible.
Those who have taken the time to become acclimatized to my system not only have no trouble reading it, they tend to prefer it.

Thanks... Mike