MATLAB: Transparent and Multi-Color 3D-Surfaces

mesh plottransparency

Hello Community,
I've got a problem with coloring two mesh-plots. The upper one should be sort of transparent, so that the plot below is also visible. I've already tried to apply the alpha-function with a very low value, but I cannot see a significant change in the transparency of the first mesh plot.
Here is my code:
figurehold ons1 = mesh(radius_interp, force_interp, bow_length);alpha(s1,0.01)colormap(jet)freezeColorss2 = mesh(radius_interp, force_interp, bow_length_tape, 'FaceAlpha', 0.8);map = [0.3, 0, 0    0.4, 0, 0    0.5, 0, 0    0.6, 0, 0    0.8, 0, 0    1.0, 0, 0];colormap(map)freezeColors% Plot Axisaxis([0 200 0 500 0 70])daspect([1 1 1])