In amorphous materials atoms and molecules are arranged randomly. In contrast to a crystal, no regular structure is formed here. An amorphous substance is formed e.g. by a fast transition from the molten to the solid state. An example of this is glass.

In electroplating, layers with an amorphous structure are formed, e.g. in metal deposition by charge exchange or in electroless nickel coatings with a high phosphorus content. This is also referred to as “metallic glasses”.