Ms. Debianchi, RELATIVE PHASE BETWEEN QUANTUM TRANSMISSION AND REFLECTION AMPLITUDESIN ONE-DIMENSION - COMMENT, Physics letters. A, 219(5-6), 1996, pp. 359-359
A recent result by Fu [Phys. Lett. A 205 (1996) 419] can be found in t
extbooks. His assertion of the unobservability of an additional arbitr
ary phase factor is disputed.