I will be applying shop sawn veneer to both sides of a 9 mm. panel of baltic birch. While understanding that plywood is made of an uneven # of plies with alternate grain direction, I wonder if my add-on veneer should follow that cross grain construction or should be applied in the same direction as the underlying ply to avoid micro splitting from later wood movement. Clearly commercial plywood makers have dealt with this in their choice of glues, heat, and pressure. However, I will be using PVA glue and a hand iron, so my question may be relevant. Or is it quibbling?