Working with layers : Deleting layers and clearing layer contents
 
Deleting layers and clearing layer contents
You can remove a layer from an image or clear the contents of a layer. Clearing a layer’s contents keeps the layer within the image; raster and vector layers become transparent, and the background layer is filled with the current background color and material.
To delete a layer
Edit workspace 
1 On the Layers palette, select the layer or layer group you want to delete.
2 Click the Delete Layer button .
 
You can also
 
Delete a selected layer from the Layers menu
Choose Layers Delete.
Delete a selected layer by right-clicking
Right-click on the Layers palette, and choose Delete.
Delete a selected layer by dragging
Drag the layer to the Delete Layer button.
To clear the contents of a layer
Edit workspace 
1 On the Layers palette, click the name of the layer you want to clear.
Make sure that nothing is selected outside the layer.
2 Choose Edit Clear.
You can also clear a layer by pressing Delete.