Polycrystalline material having low mechanical strain; method for producing a polycrystalline material

A polycrystalline material having low mechanical strain, comprising:

• one or more layers of a first type;
• and
• one or more layers of a second type;
• wherein:
• each of the one or more layers of the first type and each of the one or more layers of the second type includes at least one polycrystalline material component;
• an average of crystal grain sizes of each of the one or more layers of the first type is smaller than an average of crystal grain sizes of each of the one or more layers of the second type;
• the one or more layers of the first type and the one or more layers of the second type are situated, at least in part, one above the other in an alternating sequence;
• in each respective layer of at least one of the one or more layers of the first type, the crystal grain sizes of the respective layer change between a first end of the respective layer and a second end of the respective layer so that an average of respective crystal grain sizes of respective crystal grains at the first end of the respective layer is different than an average of respective crystal grain sizes of respective crystal grains at the second end of the respective layer;
• and
• in each respective layer of at least one of the one or more layers of the second type, the crystal grain sizes of the respective layer change between a first end of the respective layer and a second end of the respective layer so that an average of respective crystal grain sizes of respective crystal grains at the first end of the respective layer is different than an average of respective crystal grain sizes of respective crystal grains at the second end of the respective layer.