Emerging Views of Earth's Core - an E′ Layer at the Top of the Outer Core?

Jessica C E Irving, Princeton University, Department of Geosciences, Princeton, NJ, United States, Sanne Cottaar, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, Vedran Lekic, University of Maryland, Department of Geology, College Park, MD, United States and Wenbo Wu, CalTech Seismological Laboratory, Pasadena, United States