  We present a model for the lower overshoot layer of the Sun, based on the
realistic solar stratification, without the use of a "mixing-length" parameter,
by solving the system of Reynolds momentum equations using the closure
formalism of Canuto & Dubovikov (1997, 1998). A fixed value of velocity
anisotropy is assumed, and the local convection model is assumed to be valid
for the convectively unstable layer. In accordance with seismic constraints,
overshoot (defined as the amount by which the convectively mixed zone extends
beyond its boundary in local theory) is found to be as low as about 6 percent
of the pressure scale height, and it is not bounded by a discontinuity from
below.
