Now we’ll represent several circles. That is why we need to select the
Ellipse Tool (U) and for the beginning we’ll represent the outside edges of the circle. Then press the
Alt button to cut out the inside figure’s part.
The layer’s parameters:
Fill 0% on the layers.
Blending Options>Gradient Overlay
Gradient’s parameters:
The next circle should be drawn, following the earlier described method, selecting the same tool also.
The layer’s parameters:
Fill 0% on the layers.
Blending Options>Gradient Overlay
Gradient’s parameters: 
