Quantum-dot cellular automata (QCA) becomes a promising model of computation as it possesses extreme-high packing density, ultra-high speed and low power dissipation for various nanoscale computing architectures. In this work, QCA based designs of Feynman, Toffoli, Fredkin and Peres gates are presented. These elementary gates are realized by utilizing layered T logic reduction technique. The QCA designs are evaluated in terms of QCA design metrics like the number of quantum cells, area, and delay. The analysis shows significant improvements over existing models in terms of QCA design metrics. As a result, the proposed layered T based QCA layouts of elementary reversible gates become an excellent candidate for developing multilevel reversible circuits.