The matters needing attention in the Printed Circuit Board layout design are as follows:
Single panel: this type of panel is usually used lower cost requirements. In layout design, components are sometimes needed or cross wire are used to skip the routing of the circuit board. If the quantity is too large, consider the use of double sided panels.
Double sided plate: it can be used or PTH free. Because the PTH board is expensive, it will be used when the circuit complexity and density are needed. In layout, the number of wires on the component surface must be kept at least, so as to ensure that the material needed is easy to obtain.