how to rename for set (Created by surfaceShader).
createRenderLayer -name "Ao" -number 1 -noRecurse `ls -selection`;
renderLayerPresetMenu "menu" "Ao";
mrRenderLayerPresetMenu "Ao";
mrRenderLayerBuiltinPreset occlusion Ao;
rename "surfaceShader1" "Occ_Shader";