The Dirac equation requires a treatment of the step potential that differs fundamentally from the
traditional treatment, because the Dirac plane waves, besides momentum and spin, are characterized
by a quantum number with the physical meaning of sign of charge. Since the Hermitean operator
corresponding to this quantum number does not commute with the step potential, the time displacement
parameter used in the ansatz of the stationary state does not have the physical meaning of energy.
Therefore there are no paradoxal values of the ‘energy’. The new solution of the Dirac equation with
a step potential is obtained. This solution, again, allows for phenomena of the Klein paradox type,
but in addition it contains a positron amplitude localized at the threshold point of the step
potential.