It was known that the high-temperature cuprate superconductors have a complex lattice structure [REF].
All new high-temperature superconducting materials discovered in the years 2001-2013 are heterostructures at atomic limit made of the active atomic layers: honeycomb boron layer in diborides, graphene in intercalated graphite, CoO2 atomic bbc monolayers in cobaltates, FeAs atomic fluorite monolayers in pnictides, FeSe atomic fluorite monolayers in selenides.