A seal assembly (52; 152; 252) comprising: a first layer (56A; 156A; 256A) comprising: a first base; and a first plurality of fingers extending from the first base wherein the first plurality of fingers are separated by a first plurality of slots and wherein each of the first plurality of fingers includes one of a first plurality of orifices (64A; 164A; 264A); a second layer (56B; 156B; 256B) adjacent to the first layer (56A; 156A; 256A), the second layer (56B; 156B; 256B) comprising: a second base; and a second plurality of fingers extending from the second base wherein the second plurality of fingers are separated by a second plurality of slots and wherein each of the second plurality of fingers includes one of a second plurality of orifices (64B; 164B; 264B); wherein each of the first plurality of slots is spaced apart laterally from each of the second plurality of slots; and wherein the first plurality of orifices (64A; 164A; 264A) is partially overlapped by the second plurality of orifices (64B; 164B; 264B) such that a first area of each of the first plurality of orifices (64A; 164A; 264A) extends beyond a second area of each of the second plurality of orifices (64B; 164B; 264B), characterised in that: each of the second plurality of orifices (64B; 264B) has a first circular shape; and each of the first plurality of orifices (64A; 264A) has a second circular shape wherein the first area is larger than the second area, or in that: each of the first plurality of orifices is a first slot extending in a first direction; and each of the second plurality of orifices is a second slot extending in a second direction that is perpendicular to the first direction. a first layer (56A; 156A; 256A) comprising: a first base; and a first plurality of fingers extending from the first base wherein the first plurality of fingers are separated by a first plurality of slots and wherein each of the first plurality of fingers includes one of a first plurality of orifices (64A; 164A; 264A); a first base; and a first plurality of fingers extending from the first base wherein the first plurality of fingers are separated by a first plurality of slots and wherein each of the first plurality of fingers includes one of a first plurality of orifices (64A; 164A; 264A); a second layer (56B; 156B; 256B) adjacent to the first layer (56A; 156A; 256A), the second layer (56B; 156B; 256B) comprising: a second base; and a second plurality of fingers extending from the second base wherein the second plurality of fingers are separated by a second plurality of slots and wherein each of the second plurality of fingers includes one of a second plurality of orifices (64B; 164B; 264B); a second base; and a second plurality of fingers extending from the second base wherein the second plurality of fingers are separated by a second plurality of slots and wherein each of the second plurality of fingers includes one of a second plurality of orifices (64B; 164B; 264B); wherein each of the first plurality of slots is spaced apart laterally from each of the second plurality of slots; and wherein the first plurality of orifices (64A; 164A; 264A) is partially overlapped by the second plurality of orifices (64B; 164B; 264B) such that a first area of each of the first plurality of orifices (64A; 164A; 264A) extends beyond a second area of each of the second plurality of orifices (64B; 164B; 264B), characterised in that: each of the second plurality of orifices (64B; 264B) has a first circular shape; and each of the first plurality of orifices (64A; 264A) has a second circular shape wherein the first area is larger than the second area, or each of the second plurality of orifices (64B; 264B) has a first circular shape; and each of the first plurality of orifices (64A; 264A) has a second circular shape wherein the first area is larger than the second area, or in that: each of the first plurality of orifices is a first slot extending in a first direction; and each of the second plurality of orifices is a second slot extending in a second direction that is perpendicular to the first direction. each of the first plurality of orifices is a first slot extending in a first direction; and each of the second plurality of orifices is a second slot extending in a second direction that is perpendicular to the first direction.