Note on $Spin(3,1)$ tensors, the Dirac field and GL(k, R) symmetry

We show that the rank decomposition of a real matrix r, which is a $Spin(3,1)$ tensor, leads to $2k$ Majorana bispinors, where $k= rank\: r$. The Majorana bispinors are determined up to local GL(k, R) transformations. The bispinors are combined in pairs to form k complex Dirac fields. We analyze in detail the case $k=1$, in which there is just one Dirac field with the standard Lagrangian. The GL(1, R) symmetry gives rise to a new conserved current, different from the well known $U(1)$ current. The $U(1)$ symmetry is present too. All global continuous internal symmetries in the $k=1$ case form the $SO(2,1)$ group. As a side result, we clarify the discussed in literature issue whether there exist algebraic constraints for the matrix r which would be equivalent to the condition $rank\: r=1$.