MT explains it all in very simple terms during this presentation...

MT explains it all in very simple terms during this presentation from 15:36. Definitely worth a watch.

Graphite has exponentitally greater electrical conducitvity the thinner it gets, so single layer is more electrically conductive than multi layer. Some customers call multi layer graphene "graphene" but a nobel scientist might argue and say graphene is single layer. Talga don't worry about what is technically "graphene" though, and are focused on the customer outcome being sought and cost they're willing to pay (0.1 micron diamater graphite (graphene) was about US$200k tonne back in 2016).

They can definitely produce single layer graphene too. MT demonstrates Talga's electrochemical exfoliation process, which he says can take an unprocessed graphite rock straight from the ground and produce single atom (single layer) graphene for the first time in the world. Amazing stuff.