In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Forrest wrote:

Hold it up to the light and look for circuits buried inside the board.

Everyone should really use the correct terminilogy here. A board with a circuit one one side is called a single-sided circuit board. A board with a top and a bottom circuit is typically called a double-sided circuit board. A board with a top circuit, two middle circuits and a bottom circuit is called a 4 LAYER board, etc.

Ply refers to a layer of resin impregnated woven glass cloth used to construct a circuit board and one ply is typically 0.0035 in. thick, but this can vary depending on the style of woven glass cloth.

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