Layering means that the inner or lower hair is longer than the outer or upper hair. Its almost the opposite of tapering. Short layers means the hair at the top of the head is short. Long layers or slightly layered means the hair at the top of the head is relatively long. So, you can have long hair with short layers, and you can have short hair with long layers.
Short layers tend to make the hair puff-up, long layers tend to make the hair lay flat.
In this instance, stack-cutting could be considered either layering or tapering. In this example, the hair is cut in a bob and styled off the face. Long-layered short haircut with heavy bangs and fitted ncek line. Here it is again but turned under and forward. On thin hair, this look is easy to attain.