CREATE TABLE table_101336_1 (no_of_cu_o_planes_in_unit_cell VARCHAR, formula VARCHAR)

How many times is the formula tl 2 ba 2 cuo 6?
SELECT no_of_cu_o_planes_in_unit_cell FROM table_101336_1 WHERE formula = "Tl 2 Ba 2 CuO 6"
SELECT "no_of_cu_o_planes_in_unit_cell" FROM "table_101336_1" WHERE "Tl 2 Ba 2 CuO 6" = "formula"