There is no specific information available on the exact thickness of New Zealands Antipodia Schist slabs. However, schist is a metamorphic rock that typically forms in thin layers or sheets. The individual layers of schist can vary in thickness, but they are generally between a few millimeters to a few centimeters thick. The exact thickness of the slabs can depend on various factors such as the specific deposit of schist, the cutting and processing techniques used, and the intended use of the slabs.