Silver layers splitting

Silver, P. G. Savage, M. K. 1994. The interpretation of shear wave splitting parameters in the presence of two anisotropic layers. Geophysical Jourrml International, 199, 949-963. 

To obtain a pre-formatted master, a polymer photoresist is spin-coated onto a glass disc, and is rotated with high precision under an argon-ion laser that is modulated with the information. The resist is then developed and coated with a thin layer of silver, and a nickel master is grown by electroplating. When the master is split away from the polymer, it contains a perfect replica of the pre-format information. 

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