R plane -- (1-102) orientation sapphire wafer is being used as a superconductor substrate due to less mis-matched lattice and stable chemical and physical properties.
Wafer size
2" dia x 0.5 mm thickness
(1-102) C plane orientation +/- 0.5o
Polished surface
Both-sides optically polished
Surface roughness
< 5A by AFM
Package
Each wafer is packed in 1000 class clean room with 100 grade plastic bag with wafer container.
Precaution
R plane sapphire wafer is easy to cleave compared with C plane's. Please handle it with a care