  We present a measurement of the left-right cross-section asymmetry (ALR) for
Z boson production by e+e- collisions. The measurement includes the final data
taken with the SLD detector at the SLAC Linear Collider (SLC) during the period
1996-1998. Using a sample of 383,487 Z decays collected during the 1996-1998
runs we measure the pole-value of the asymmetry, ALR0, to be 0.15056+-0.00239
which is equivalent to an effective weak mixing angle of sin2th(eff) =
0.23107+-0.00030. Our result for the complete 1992-1998 dataset comprising 537
thousand Z decays is sin2th(eff) = 0.23097+-0.00027.
