An electro-optic device comprising: a first electrode structure comprising: a first electrode layer comprising a concentric first plurality of electrode rings, each adjacent pair of electrode rings from said first plurality of electrode rings separated by a corresponding first layer separator from a concentric plurality of first layer separators; and a second electrode layer comprising a concentric second plurality of electrode rings, each adjacent pair of electrode rings from said second plurality of electrode rings separated by a corresponding second layer separator from a concentric plurality of second layer separators; said first plurality of electrode rings is offset with respect to said second plurality of electrode rings; wherein: said first electrode layer is positioned parallel to said second layer; and a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; characterized in that said second electrode layer is configured to be operably conductively unconnected to an electrical power source. a first electrode structure comprising: a first electrode layer comprising a concentric first plurality of electrode rings, each adjacent pair of electrode rings from said first plurality of electrode rings separated by a corresponding first layer separator from a concentric plurality of first layer separators; and a second electrode layer comprising a concentric second plurality of electrode rings, each adjacent pair of electrode rings from said second plurality of electrode rings separated by a corresponding second layer separator from a concentric plurality of second layer separators; a first electrode layer comprising a concentric first plurality of electrode rings, each adjacent pair of electrode rings from said first plurality of electrode rings separated by a corresponding first layer separator from a concentric plurality of first layer separators; and a second electrode layer comprising a concentric second plurality of electrode rings, each adjacent pair of electrode rings from said second plurality of electrode rings separated by a corresponding second layer separator from a concentric plurality of second layer separators; said first plurality of electrode rings is offset with respect to said second plurality of electrode rings; wherein: said first electrode layer is positioned parallel to said second layer; and a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; characterized in that said second electrode layer is configured to be operably conductively unconnected to an electrical power source. wherein: said first electrode layer is positioned parallel to said second layer; and a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; said first electrode layer is positioned parallel to said second layer; and a rotational axis of the first electrode layer is co-incident with a rotational axis of the second electrode layer; characterized in that said second electrode layer is configured to be operably conductively unconnected to an electrical power source. <EOS>