(d) The relative valence and conduction band edge of some common TMDs (monolayer ... Transition Metal Dichalcogenides (TMDs) are a type of layered material, formed from one of the transition metals ...

This layer is cooler but still very hot, perhaps 7,200 to 9,000 degrees Fahrenheit (4,000 to 5,000 degrees Celsius). It too is composed mostly of iron, plus substantial amounts of sulfur and nickel.