  We demonstrate gate control of the electronic g-tensor in single and double
quantum dots formed along a bend in a carbon nanotube. From the dependence of
the single-dot excitation spectrum on magnetic field magnitude and direction,
we extract spin-orbit coupling, valley coupling, spin and orbital magnetic
moments. Gate control of the g-tensor is measured using the splitting of the
Kondo peak in conductance as a sensitive probe of Zeeman energy. In the double
quantum dot regime, the magnetic field dependence of the position of
cotunneling lines in the two dimensional charge stability diagram is used to
infer the positions of the two dots along the nanotube.
