Benjamin F. Chao has suggested that Bullen's layer just above the mantle-core boundary be renamed the Bullen layer. I believe that this is inappropriate. Boundaries and layers in the Earth are most properly named after their discoverers or those who first measured their location or properties. Cornelius G. Dahm  first described this layer and deserves to have it named after him. This is appropriate also because it is convenient to have a short, easy-to-remember name that is similar to D″, which has been in use for a long time.