I have used some leaves as well. Once we begin to understand soil biology, and how healthy plants are actually grown, it's amazing that the system works better when we stand back and get out of the way.
. I live in an area (desert) that receives about 3.5 to 5 inches of precip per year, and we have no topsoil. I have several places where the covering has been applied, and rich, dark soil is beginning to form. Listened to a gentleman named Gabe Brown speak at a small farm conference. He is doing AMAZING things on a larger scale (5,000acres), and re-writing the rules for sustainability.