I just realized that I meant to say "top" instead of "bottom", for the ground plane.
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Dont understand what you mean by this!There is no magic in shape
78/79 regulators are not the best by today's standards, but that was not your question.
Let me be very contrary: There is no such thing as ground, just a place arbitrarily designated as a circuit reference point. There is no magic in shape. You should treat the source and sink with the same diligence. My habit is to use double side board and make the top all ground. This gives me more space to deal with V+ and V- on the bottom side and a cleaner, more straight, and more compact layout. ref: comment by gootee.