has to be considered. The choice of the totally antisymmetric Lorentz tensor of second rank, B [ α i β i ], in the above equation (8A) is only optional. It is possible to start with multiple Kronecker products of totally symmetric second rank Lorentz tensors, A α i β i. The latter option should be of interest in theories where high-spin D ( j , 0 ) ⊕ ⊕ D ( 0 , j ) Joos–Weinberg fields preferably couple to symmetric tensors, such as the metric tensor in gravity.