A MarkToBaseAdjustmentRecord defines the positional adjustment between a base glyph and mark glyph.
| baseGlyphAnchorPoint | The position of the anchor point of the base glyph. |
| baseGlyphID | The index of the base glyph. |
| markGlyphID | The index of the mark glyph. |
| markPositionAdjustment | The positional adjustment of the mark glyph relative to the anchor point of the base glyph. |